One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,8)(4,6)(5,7)(11,15)(14,16)(17,18)(19,26)(20,21)(22,24)(23,28)(25,31)(27,32)(29,30) involution — undirected(9,10)(11,14)(12,13)(15,16)(17,19,21,28,22,29,31,32)(18,23,25,26,24,27,20,30)(1,3,5,4)(2,6,7,8)(10,13)(14,16)(17,20)(18,21)(19,26)(22,25)(23,32)(24,31)(27,28)(29,30)(1,4,5,3)(2,6,7,8)(10,13)(14,16)(17,18)(19,27)(20,31)(21,25)(22,24)(23,29)(26,32)(28,30)(9,11,12,15)(10,14,13,16)(18,24)(20,25)(23,27)(26,30)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.